Despite that, the automatic gearbox has a system for measuring oil quality
.

The AL4 autoadaptive automatic gearbox ECU has an oil wear sensor
.

For a given time interval, the counter increases by a certain number of units (of wear) depending on the temperature of the gearbox
.

When the counter is exhausted, the gearbox ECU informs the driver of the presence of a fault by the flashing of the Sport and Snow indicator lights on the instrument panel
.

Using the diagnostic equipment, the technician checks whether or not it is necessary to replace the gearbox oil
.

For any operation requiring a top-up of at least 0,5 litre(s) of gearbox oil, update the oil wear counter by using the diagnostic equipment
.

IMPERATIVE :
in the case of an automatic gearbox oil change, following flashing of the Sport and Snow indicator lights with a message on the diagnostic equipment: Oil Change to be Carried Out = Yes + counter exhausted at units, fill in the automatic gearbox form ; see SERVICE INFORMATION(s) : repair procedure BVA 4HP20 / AL4 / MB3 number 425 and 399
.